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| 型号： | LTC3569EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 16TSSOP |
| 特色产品： | LTC3569 - Triple Buck Regulator With 1.2A and Two 600mA Outputs |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.43 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，1MHz ~ 3MHz |
| 电流 - 输出： | 600mA，1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3569
APPLICATIONS INFORMATION
Design Example 3: Dual Programmable Bucks
In this example consider two buck regulators operating
from a 2.5V to 5.5V unregulated supply that are required
to generate two independently programmable supplies that
must step from 1.2V in standby up to 1.8V when active,
with a maximum load current of 1.2A when active and
1mA in standby. Additionally, this application anticipates
possible output short circuits, and is required to operate
without damage in such a situation.
Buck 1 is selected for the first regulator, and buck 3 is
configured as a slave power stage in parallel with buck 2
by pulling FB3 up to V IN to obtain the required current level
for the second regulator. Burst Mode operation is selected
to achieve high efficiency during standby operation. The
internal 2.25MHz clock frequency is selected, as it satisfies
the minimum on-time requirement. Next, two reference
voltages are selected to match the ratio of the active to
standby voltages: 1.8V/1.2V = 1.5. The 0.75V and 0.5V
reference levels mach this ratio. The resistors shown in
Figure 7 are selected to obtain the correct feedback ratio
from standard 1% resistors. Calculating the inductor values
for 30% ripple current at maximum SV IN :
L = 1.8V/(2.25MHz ?360mA)?(1–1.8V/5.5V)= 1.5μH.
The output capacitor values are selected as the nearest
standard value to obtain 5% voltage droop at maximum
load current step.
C OUT = 2.5?1200mA/(2.25MHz ?90mV) ≈ 15μF.
Select an output capacitor with an ESR of less than 50m?
to obtain an output voltage ripple of less than 30mV.
Finally select an input capacitor rated for the worst-case
short-circuit ripple current of 2 I PK /√ 3 ≈ 2.5A, when both
outputs are shorted to GND.
EN2
V IN
2V/DIV
2V/DIV
200μs/DIV
V IN 2.5VTO5.5V
22μF SV IN PV IN
DIGITAL EN1
CONTROL
LTC3569
EN3
MODE
R T
511k
PGOOD
SGND PGND
SW1
FB1
SW2
SW3
FB2
FB3
1.5μH
1.5μH
V IN
294k
210k
294k
210k
20pF
20pF
OUT1 1200mA
1.2V STANDBY
15μF 1.8V ACTIVE
OUT2 1200mA
1.2V STANDBY
15μF 1.8V ACTIVE
Design Example 3: Soft-Start to Standby (1.2V)
500mV/DIV
500mV/DIV
CH1
OUT1
CH2
OUT2
CH3
PGOOD
CH4
EN1 = EN2
3569 F07b
3569 F07a
Figure 7. Dual Programmable Buck DC/DC Regulators: 1200mA, 1200mA
3569fd
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3569EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References |
| LTC3569EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3569EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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